Patent GB-965567-A (GB)
Title: Improvements in or relating to a method of removing or forming sealed welds applied to flanged joints
Inventor: ELLINGER JOHN HENRY
IPC: B23Q9/00
Filed: 1961-04-21
Abstract: 965,567. Welding by fusion; milling; machine tool details. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. April 16, 1962 [April 21, 1961], No. 14608/61. Headings B3B, B3K and B3R. [Also in Division B5] In making and re-making a seal weld 1, Fig. 1, between flangelets 4 on workpieces 2, 3 the workpieces are formed with flanges 2a, 3a and carrying milling, sawing or welding tools for operating on the flangelets 4. Sawing milling.-A sawing or milling machine, Fig. 2, comprises a rotary tool 7 driven by a motor 9 and housed in the body 6 of the trolley. A front bracket 10 secured to the body 6 mounts side rollers Rc engaging the sides of the flanges and one of which is resiliently mounted. A pair of rollers Ra engaging the inturned ends of the flanges 2a, 3a are carried on the ends of a bar 13 pivotally connected at its centre to the front bracket 10. The main body has cantilever arms 15 carrying rollers engaging the flangelets 4. The rear bracket 22 in addition to rollers Ra, Rc similar to those of the front bracket 10 carries a roller running on the flangelets 4. The rear bracket 22 carries a threaded rod 26, Fig. 11, engaging with a threaded collar on the body 6, the rod 26 being rotated through gears by a Geneva wheel 23 rotated step-by-step by pins 27 mounted on one of the flanges 2a, 3a to feed the tool 7 step-by-step into the flangelets 4. A rotary brush on the front of the trolley and a chip breaker are provided for dealing with waste material. The trolley is towed by a motor trolley running on the flanges 2a, 3a or on a track and receiving current from a conductor rail. Welding.-The torch trolley 50, Fig. 14, is towed by a motorised trolley 55 carrying arc initiating equipment. It is associated with a trolley 52 carrying shielding gas bottles and towed by a trailing cable motorised trolley 54. Gas from the bottles passes through a pressure switch controlling welding current to a chamber 82, Fig. 19, in the torch trolley and then through a reducing valve 81 to the torch. The chamber 82 provides gas to shield the arc for some time after the gas and welding current have been disconnected. The outer part of the torch consists of a sleeve 69, Fig. 16, non rotatably mounted but axially slidable in the body of the trolley being urged towards the work by a spring 76 and carrying work engaging rollers 73a. The electrode 61 is secured in a collet carrying a gas nozzle 63 and mounted in a ceramic sleeve 64. A copper tube 65 fits tightly on the sleeve 64 and has a slotted return-flange end non-rotatably connected to the sleeve 69. A finned cooling tube 70 is in differential threaded relation with the sleeve 69 and the tube 65 so that rotation of the tube 70 extends the centre portion of the torch relative to the rollers 73a. The cooling tube 70 is slotted longitudinally to form fingers held against the copper tube 65 by a copper coil spring 72. The torch trolley carries in arms 88, Fig. 1d, balls 85 adapted to press the flangelets 4 together. A welding insert may be pre-positioned in the seam.